模糊调节电压矢量角度和幅值的SPMSMDTC系统

针对永磁同步电机直接转矩控制转矩和磁链脉动较大的问题，提出了模糊调节电压矢量角度与幅值表面式永磁同步电机模糊直接转矩控制系统，采用模糊控制器和空间矢量调制技术取代传统直接转矩控制系统的滞环比较器和开关表输出电压矢量。模糊控制器输入量为磁链和转矩误差，输出量为输出电压矢量的角度和幅值。基于电压矢量幅值和角度对磁链和转矩的变化影响规律设计了模糊控制规则表。为了进一步抑制转速为负时的转矩脉动，设计自适应模糊直接转矩控制系统。仿真结果表明:模糊调节电压矢量角度与幅值的直接转矩控制系统可实现四象限运行，电机系统运行良好，仅在转速为负时，转矩脉动略有增大。自适应模糊直接转矩控制系统运行效果良好，在四象限内均可较好抑制转矩和磁链脉动。

The SPMSM DTC System using Fuzzy Controller to Adjust Angle and Value of Voltage Vector

In order to solve the problems of large torque and flux ripple in direct torque control (DTC) of permanent magnet synchronous motors (PMSM), fuzzy controller and space vector modulation (SVM) are used to output voltage vector instead of hysteresis comparators and switching table in the DTC. The inputs of fuzzy controller are stator flux and torque’s error and the outputs are the angle and value of the applying voltage vector. Sp (SVM) is used to generate applying voltage vector. The fuzzy control rules are designed based on effects of angle and value of voltage vector on the change of stator flux and torque. In order to suppress torque ripple at negative speed, two membership functions of torque error are designed and the adaptive fuzzy control system can select the proper membership function according to motor speed. Simulation results show the proposed fuzzy control system works properly and only when motor speed is negative, torque ripple is a little higher. The adaptive fuzzy control system can effectively reduce torque and flux ripple in four quadrants.